What do you mean why? Dogs lick their own bums, they carry bacteria and all kinds of little dangerous organisms on their body, paws, bum... and then they put those body parts on the pillow on which someone will put their mouth, face..... Just ewwww..... I'd never allow that, especially not with kids.

We have a queen bed but thankfully only a cat and sometimes the small dog join us. My black lab is older and struggles to get on the bed, even so if it is just one of in the bed, she will join that one person but she knows there is too little room for three of us together.

We usually get a dog and a cat. Occasionally we get two cats. Every once and a while, the third (feral) cat lurks around at the end of the bed. When this happens, there is usually a fair amount of growling and hissing. Peace is restored when everyone but Felix (and us) leave the bed. Felix falls asleep when we go to bed and is in the same spot in the morning. I have never had another pet, dog or cat, do that.